She was found guilty of murder at Birmingham Crown Court in April and ordered to serve at least 24 years behind bars before she can apply for parole.

Her partner, Matthew Rigby, also 23, was cleared of the toddler’s murder, but found guilty of causing or allowing her death and jailed for three-and-a-half years.

By its verdicts, the jury decided Smith delivered the fatal blow, described during the trial as ‘probably a stamp’ which tore the toddler’s heart.

Ayeeshia Jane girl could be heard by neighbours begging ‘stop mummy, stop daddy’ days before she was stamped on to death (Picture: SWNS)

Smith, of Overseal, Swadlincote, Derbyshire, today challenged her conviction at the Appeal Court, in London, with her lawyers arguing it was ‘unsafe’.

Her barrister, John Butterfield QC – who also represented her at trial – argued that an interruption by the trial judge as he made his closing speech in Smith’s defence caused ‘prejudice’ in the minds of jurors.